Chain wrench.



No. 826,939. PATENTED JULY 24:, 1906.

C'. I. HULTGRBN. Y CHAIN WRENCH.

APPLICATION FILED IBB. 23, 1906.

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UNITED STATES PATENT OFFICE.

:'Speciication `of LettersPatent.

, Application filed-February 23,1906. Serial No. 302.497-

flo all whom ffm/ahy concern:

Be it known that I, CHARLES HULT- l GREN, a citizen ofl theUnitedStates, residing .atChicago, inathe county of Cook and'State,ofIllinois, havei-nventedanew and useful Improvement in ChainWrenches,ofwhich l therfolhlowing isa specification.

:being seated; ini-position on a `similar .view 4Showing -the .wrenchafter. the slack: has Fig.. 3, a broken plan; view of \.wrench; fFig. 4,asimilar-view showing the My invention relates primarily to animprovement on-the subject-matter of Patent No. 733,648, .granted tomeJuly 14, 1903, for chaintongs,l though my present improvementsvare notnecessarily limited' to use with theparticular construction for ywhichthat Apatent-was granted.

1 One .of my objects isV to provide -a construc- 4tion Awhereby `thelslack ofthe chain/in adjusting :the wrench Von the `article to `.be`gripped y,preparatory fto i operating `the tool shall beftakenupitothefullest possibleA extent, thereby to adaptv the. jaws toengagethe article between their lends.

Another object 1 is i to :provide a construc- .tion in .which the' freeendof the chain may be :readily disconnected fromy the .-wrench.

.'My. invention is illustrated in the accomfpanyingdra-Win s, in which``Figure 1 isfa` roken view, in side elevation',representi=ngimy improved.wrench as pipe preparaslack Fig. 2, a position of the been taken up gthe head of the tory tol the. taking up of the free end of. the chainfastened on the head of the.wrench;.Fig.i5, a side view of one of the jaw-equipped head-forming members, .showing a portion of the chain indotted lines; and Fig. 6, a section taken: throughthe head and handle atthe line 6 on Fig, 5 and viewed in the direction of the arrow.

A is the operating-handle, provided at one end with a head B, preferablyformed of two jaw-equipped plates or members C C, secured to the end ofthe handle, as by bolts l) b, each member C being provided at its outerend with an arc-shaped serrated jaw C. The serrated surfaces of the jawsas represented are beveled to provide a channel C2 of V shape incross-section to enable the jaws to 1 pipe D, whilethe chain is beingadjusted about it.

E is a `chain permanently secured atl one of its ends tothefhead Bbeyondthehollowed `seat 0c andbetween themenibers'C by. apin e passingthrough an end= link, the other orfree gripped, Ysuch as a .end of thechain `being adapted-to @be re- -leasably heldin place on. the head, as'hereiny after described.

recessed, as shown at 2, andftheupper-forward surfaces of the members Care grooved, as shown at Q/,and terminateon the-front surfaces of theears in cam-guides C2,.adjacent to the recesses.

To apply the wrenchto an article'tobe gripped, such as a pipeD,thehead-B is -applied at its concave seat upon the pipe and the free endof the chainis adjusted about the pipe and over the outer end ofthehead,

i the chain being separably secured in place on the head by insertingthe proper link into the recesses Assuming the wrench to be applied tothe pipe D, as shown,the handle is then raised to take up the slackinthe chain and to bring the serrated jaws Cy into engagement with thepipe, as shown in Fig. 2. To release=the wrench, the'handle isllowered,thereby producing slack in the chain and permitting the link confined inthe recesses f to be withdrawn lon itudinally therefrom in the directiontoward the rear end of the jaws," the cams C2 serving to raise theconiined link and carry it out of the recesses by pulling upon the endof the chain.

It will be seen that by providing the under surface of the head with aconcave seating-surface with the chain depending from the eXtreme rearend of the latter the amount of slack which must be taken up in clampingthe wrench is much less and shorter grip is attainable than in thosedevices in which no such seat is provided and in which the chain ispassed backwardly in encircling the pipe with it. Y It is also manifestthat the pro- IOO IIO

Vision of a cam-surface forward of the link-` confining recesses fserves to facilitate the rellasing of the free end of the chain from theead. l

A further useful function of the grooves y is to guide the free end ofthe chain in adjust- Iing it upon the head to cause the link adj acentto the recesses to be automatically moved into osition opposite thereto,thus to facilitate t e introduction of the link into the recesses.

By providing a recessin the nose of the` head for receiving the chainthe depending portions of the latter after the chain has been adjustedabout the pipe and on the head are approximately parallel with eachother, thereby, in conjunction with the curved adapted to encircle anarticle to be gripped and to coperate with said jaw in the grippingoperation, said wrench being provided with a concave seat on its underside and said chain being fastened at the rear end of said seat.

2. A chain wrench comprising, in combiv nation, an operating-handle, ahead on said handle having a recess in its outer end and v provided witha jaw, and a chain secured at one end on said head and adapted toencircle an article to be gripped and to cooperate with said jaw in thegripping operation, the under side of said head being provided with aconcave seat intermediate said jaw and the point v of attachmentof saidchain to the head.

3. A chain wrench comprising, in combination, an operatmghandle, a headon one end of the handle having a recess in its outer end and providedwith a serrated jaw having a serrated channel in its clamping-surface,and a chain secured to said head and adapted to encircle an article tobev gripped and to cooperate with said jaw in the gripping operation,said head being provided on its under surface intermediate said jaw andthe point of attachment of the chain to the head7 with a concave seat.

4. A chain wrench com rising, in combination, an operating-hand e, ahead on said handle having a recess in its outer end and provided with ajaw, a chain secured at one endon said head, a recess in said headadapted to receive and releasably hold therein the free end of thechain, and a camuide on said head adjacent to said recess an adapted torelease the chain, for the purpose set forth.

5. A chain wrench comprising, in combination, an operating-handle, ahead on said handle having a recess on its outer end and comprising apair of jaw-equipped members provided on their upper portions with earshaving link-receiving recesses in their rear ends, the upper forwardsurfaces of said members being grooved and provided with cam-guidesadjacent to said recesses, and a chain secured at one end on said headand having the links at its free end adapted to enter and be releasablyheld in said recesses, saidguides being adapted to be engaged by thechain, for the purpose set forth.

6. A chain wrench comprising, in combination, an operating-handle, ahead on said handle having a recess in its outer end and comprising apair of j aw-equipped members, separated from each other along theirupper portions to form between them a channel and provided on theirupper portions with ears containing recesses inthe rear ends, the upperforward surfaces of said members being grooved and each terminating in acamguide adjacent to said recesses, and a chain secured at one end tothe head and having the links of its free end adapted to be insertedinto said channel and grooves and into said recesses, for the purposeset forth.

CHARLES F. HULTGREN. In presence of- J. H. LANDES, G. A. OHRITTON.

